Must be a typo, as the heading to the paragraph from the National Archives states "1901-1982"
Industry, Business and Work - Radenite Batteries
20A-Manor House Coventry
32 of 34Mon 11th Apr 2022 8:19am
Recent purchase from ebay:
I did have one of those badges when I worked there, but mine was lost when the jacket it was on got stolen not long after the factory closed. It has only taken me nearly 40 years to get a replacement (and a spare).